Hi Jaco,
Yes; we have seen similar issues with buffering and " disconnected" messages when the Explora is physically on line and connected t a fast internet connection. The issues are more commonplace when watching in HD.

The network paths to the media servers apparently vary. I know that @GeoffD has done some work on this.

My SP is MWEB and I certainly see the issue at peak times. Mid-evening.

As users we have no certain way of locating the point of constraint; but MC does. It is aware of the issue.